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Whatman quantitative filters are designed for gravimetric analysis and the preparation of sample for instrumental analysis. Hardened filter papers with 0.015% ash maximum are treated with a strong acid to remove trace metals and produce high wet strength and chemical resistance. These filters are particularly suitable for Buchner filtration where the tough surface of the filter makes it easy to recover precipitates. All hardened papers are sold as packs of 100.
Grade 50 (2.7µm)
Retention of very fine crystalline precipitates. The thinnest of all Whatman filter papers. Slow flow rate. Hardened and highly glazed surface. This finish also keeps the paper free from loose surface fibers. Highly suitable for qualitative or quantitative filtrations requiring vacuum assistance on Büchner or three-piece filter funnels. Very strong when wet. Will withstand wet handling and precipitate removal by scraping. In the electronics industry, the virtual absence of fiber shedding is utilized in carriers for integrated circuits.
To help you choose the right filter for your application please click on the image below that will take you to the application guide for:
 There is also a link to the Cytiva Filter Paper Selector Guide
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